Hi someone answered this but mainly for PA protection as most mobiles are made for limited tx time. I made a UHF rptr with 2 GM300,s and an ICS controller, but I turned down the pwr to just 3 watts and fed it into a 6dB gain ant so erp is around 12w works well and gives the coverage I need. I will fit a better fan when I get time. Being in the UK we are only allows 25w erp so with a good ant no need to set tx pwr high. I also built a 6mtr rptr using 2 low band maxtracs and did the manual pwr mod to the tx unit, all great fun
Steve ----- Original Message ----- From: Larry Horlick To: [email protected] Sent: Thursday, February 25, 2010 7:23 PM Subject: Re: [Repeater-Builder] Pair of GM300 as a repeater Steve, So the reason for turning down the power is for PA protection or RF suppression? lh On Thu, Feb 25, 2010 at 2:00 PM, Steve <[email protected]> wrote: Hi they work OK but you must turn the tx pwr right down and fit a fan or pa won't last long. It is down to the duplexer finding a unit suitable at the right price will be almost impossible, the 5Mhz split is ok as you can get cheap duplexers from Hong Kong 73 Steve ----- Original Message ----- From: "la88y" <[email protected]> To: <[email protected]> Sent: Thursday, February 25, 2010 4:46 PM Subject: [Repeater-Builder] Pair of GM300 as a repeater > > > I'm wondering about the suitability of a pair of VHF GM300s as a repeater. > Is the shielding sufficient to allow 600 kHz between Rx and Tx? If not, > what is the suggested minimum? > > Same questions for UHF SM50, but with a 5 mHz split? > > lh > > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
